Specifications

A/C System Components

Compressor

Clutch

A drive belt from the crankshaft pulley drives the compressor. Some

systems use V-belts and some use a flat, multirib belt to help reduce

rictional loss and noise. On some models, a single serpentine V-belt

drives all the engine accessories including the A/C compressor. In this

kind of system, an automatic tensioner maintains the correct serpentine

belt tension.

The compr

essor clutch engages and disengages the compressor as needed.

With the clutch disengaged (not energized), there is no refrigerant flow

and the compressor pulley spins freely.

The single-plate clutch has an electromagnetic pressure plate to allow

the compressor pulley to freewheel or drive the compressor as conditions

demand. The clutch is normally disengaged. When a relay is energized,

the electromagnetic coil pulls the spring-loaded pressure plate into

the clutch.

3-11

TOYOTA Air Conditioning and Climate Control – Course 752

Serpentine Belt

System

Some models have

a single belt that drives

multiple components.

Compressor

Clutch

Engages compressor by

electromagnetic action.

Idler Pulley

A/C

Compressor

Pulley

Crankshaft Pulley

Rotor

Shim

Stator Coil

Bearing

essure Plate

Fig. 3-12

752f312

Fig. 3-13

752f313

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